<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 添加按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="addCateDialog">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 -->
      <tree-table class="treeTable" :data="cateList" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="#" border :show-row-hover="false">
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
            <i class="el-icon-success" style="color: lightgreen;" v-if="scope.row.cat_deleted === false"></i>
            <i class="el-icon-error" style="color: red" v-else></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
            <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
            <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
            <el-button type="primary" size="mini" icon="el-icon-edit" @click="editCateDialog(scope.row.cat_id)">编辑</el-button>
            <el-button type="danger" size="mini" icon="el-icon-delete" @click="deleteCateDialog(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>

      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 20]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total">
      </el-pagination>
    </el-card>


    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed">
      <!-- 表单区域 -->
      <el-form :model="addCateForm" :rules="addCateRules" ref="addCateRef" label-width="100px" class="demo-ruleForm">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <el-cascader
            expand-trigger="hover"
            v-model="selectKeys"
            :options="parentCateList"
            :props="cascaderProp"
            @change="parentCateChange"
            clearable
            change-on-select></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCateSave">确 定</el-button>
      </span>
    </el-dialog>


    <!-- 编辑分类的对话框 -->
    <el-dialog
      title="编辑分类"
      :visible.sync="editCateDialogVisible"
      width="50%"
      @close="editCateDialogClosed">
      <el-form :model="editCateForm" :rules="editCateRules" ref="editFormRef" label-width="100px" class="demo-ruleForm">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCateSave">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Cate',
  data () {
    return {
      // 商品分类的数据列表
      cateList: [],
      // 查询商品分类的参数对象
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 总条目数
      total: 0,
      // 为table指定列的定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          // 表示将当前列定义为模版列
          type: 'template',
          // 表示当前这一列使用模版名称
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      // 控制添加分类的对话框的显示与隐藏
      addCateDialogVisible: false,
      // 添加分类的表单数据
      addCateForm: {
        cat_pid: 0,
        cat_name: '',
        cat_level: 0
      },
      // 添加分类的表单验证规则
      addCateRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      // 父级分类的数据
      parentCateList: [],
      // 指定的级联选择器的配置对象
      cascaderProp: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 选中的父级分类的id数组
      selectKeys: [],
      // 控制编辑分类对话框的显示与隐藏
      editCateDialogVisible: false,
      editCateForm: {},
      editCateRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' },
          { min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList () {
      const { data: res} = await this.$http.get('categories', { params: this.queryInfo})
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败')
      this.cateList = res.data.result
      this.total = res.data.total
    },
    // 每页显示条目数发生改变后触发的事件
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 当前页码值发生改变后触发的事件
    handleCurrentChange (newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 添加分类的方法
    addCateDialog () {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类的数据列表
    async getParentCateList () {
      const { data: res} = await this.$http.get('categories', { params: { type: 2}})
      if (res.meta.status !== 200) return this.$message.error('获取父级分类数据失败')
      this.parentCateList = res.data
    },
    // 级联选择器中的选择项变化时触发这个函数
    parentCateChange () {
      // console.log(this.selectKeys)
      if (this.selectKeys.length > 0 ) {
        this.addCateForm.cat_pid = this.selectKeys[this.selectKeys.length-1]
        this.addCateForm.cat_level = this.selectKeys.length
        return
      } else {
        this.addCateForm.cat_level = 0
        this.addCateForm.cat_pid = 0
      }
    },
    // 添加分类
    addCateSave () {
      this.$refs.addCateRef.validate(async valid => {
        if (!valid) return
        const { data: res} = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error('添加分类失败')
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 监听添加分类对话框的关闭事件，重置表单数据
    addCateDialogClosed () {
      this.$refs.addCateRef.resetFields()
      this.selectKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    // 编辑分类的方法
    async editCateDialog (cateId) {
      const { data: res} = await this.$http.get('categories/'+ cateId)
      if (res.meta.status !== 200) return this.$message.error('获取分类数据失败')
      this.editCateForm = res.data

      this.editCateDialogVisible = true
    },
    // 编辑分类后保存提交分类信息
    editCateSave () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return 
        const { data: res} = await this.$http.put('categories/'+ this.editCateForm.cat_pid, { cat_name: this.editCateForm.cat_name })
        if (res.meta.status !== 200) return this.$message.error('编辑分类失败')
        
        this.editCateDialogVisible = false
        this.getCateList()
        this.$message.success('编辑分类成功')
      })
    },
    // 编辑分类后表单数据重置
    editCateDialogClosed () {
      this.$refs.editFormRef.resetFields()
      this.editCateForm = {}
    },
    // 根据id删除分类信息
    async deleteCateDialog (cateId) {
      const confirmResult = this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        if (confirmResult !== 'confirm') return this.$message.info('取消了删除')
        const { data: res} = await this.$http.delete('categories/'+cateId)
        if (res.meta.status !== 200) return this.$message.error('删除分类信息失败')
        this.$message.success('删除分类成功')
        this.getCateList()
    }
  }
}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 20px;
}
.el-cascader {
  width: 100%;
}
</style>
